Windscreen wiper for motor cars and the like



Aug. 19, 1924.

' L. R. JONES WINDSCiREEN WIPER FOR MOTOR CARS AND THE LIKE Filed Nov. 24, 1923 ATTORNEY Patented Aug. 19, i924.

FTENT @FFHQE.

.LEONARD REGINALD JONES, 0F LONDQN, ENGLAND.

WINDSCREEN 'WIPER FOR MOTOR CARS AND THE LIKE.

Application filed November 24, 1923. Serial No. 676,895.

To all whom it may come m Be it known that LEONARD REGINALD JONES, subject of theKi'ng of Great Britain, residing at 32 Eldon Chambers, 30 Fleet Street, London, E. C. 4, England, has invented new and useful Improvementsv in Windscreen Wipers for Motor Cars and the like, of which the following is a specifica tion.

This invention relates to wind screen wipers for motor cars and the like driven through worm or other reduction gearing by a wind vane rotated by the air pressure engendered by the forward progress of the vehicle.

The pivoted wind screen wiper, according to the present invention, is constructed and arranged to be oscillated by an eccentric device driven through reduction gearing by a wind vane.

For this purpose, the pivoted wiper is connected to a crank connected, through suitable reduction gearing, to the wind vane exposed to the air pressure, for example a twobladed air propeller fast on a forwardly directed rotary spindle mounted at the side of the wind screen. p

Air driven wind screen wipers with worm and wormwheel and spur wheel reduction gearing are illustrated on the accompanying drawing, in which gig. 1 is a side elevation partly in section, an

Fig. 2 afrontelevation.

On a larger scale:

Fig. 3 is a section on the line 33 of Fig. 1.

Fig. 4 is a rear elevation with the bearing block for the wiper arm removed, and

Fig.5 is a front elevation of this block with the gear-enclosing casing' in front thereof removed.

In the constructional embodiment of the invention illustrated, the reduction of speed is efiected by worm and wormwheel gearing.

A two-bladed air propeller a is fast on the spindle b of a worm c. The worm 0 is engaged with a wormwheel d, rotating in a caslng e.

,The inclination of the itch of the propeller a and the pitch of t e worm c are of such direction that the thrust of the spindle b is rearward, and can therefore be taken by a thrust end bearing in the casing e, instead of requiring a thrust collar on the spindle b in front of the worm a.

The wormwheel d has a crank in 9 worklng in a transverse slot h in a dis i, formed with'a spur toothed rack y.

The rack jis guided inan upright groove k in a bearing block Z, and is in engagement with a spur toothed sector m, fast on a spindle n. journalled in the block Z.

A wi er arm a is fast on an externally protrudlng end of the sector spindle n, and toits end is pivotally secured a bar p of U- section in which is pinched the flange of a tubular beaded rubber strip 9, which wipes the glass of the wind screen 7.

The arm 0 has a slight rearward rake to reach towards the wind screen 7', and the bar p with the strip g is pivoted thereto so that the b'arp may be set parallel to the surface of the wind screen '1'.

The bearing block I has acylindrical shoulder portion Z? which fits in a circular aperture in the casing e concentrically with the wormwheel d, thus permitting angular adjustment of the worm and propeller spindle 7) around the casing 6. This adjustment is limited by a screw 8 in the casing e riding in a slotway t in aflange of the block Z, and is for the purpose of setting the spindle b approximately,horizontal notwithstanding the inclination or rake of the wind screen r.

The entire device is mounted on the wind screen 9* by means of a bracket u, clamped by a screw 4) to the border of the wind screen and supporting the block I by passing through and being clamped by a screw 'w in a hole in the block Z.

The air pressure rotates the propeller a,

spindle b and worm c, which latter rotates the wormwheel d at a vastly reduced speed. On rotation of the wormwheel d its crank pin g moves the rack 7' up and down in the groove in, which causes the rack 7' to displace the sector m angularly in alternate direc-. tions, which oscillatory motion is precipitated in by the arm 0, wiper bar 72 and wiping 2. In a wind screen wiper, an air vane, a worm rotatedby said vane, a wormwheel rotated by said worm, a -block carrying said wormwheel, means for attaching said block to a wind screen frame, a casing carrying said worm and vane angularly ad ustahle on said block, a crank pin on said wormwheel, a transversely slotted disc engaged by said crank pin, a rack on said disc ided in a groove in said block, a toothe sector engaged with said rack, and a wiper .bar connected to said toothed sector.

In testimony whereof I have signed my name to this specification.

LEONARD REGINALD JONES. 

